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tabatt07 04-18-2010 01:04 PM

Connecting metal conduit to ceiling fan junction box
 
I live in Chicago and spent some time yesterday examining whether I could install a ceiling fan where a light fixture had been. I'm leaning towards calling in a professional because I can't figure out how one would connect a ceiling fan rated box. I thought I'd post here to find out 1) if my current hypothesis is correct and 2) to know what to expect when I get estimates.

Old junction box had 4 top knockouts and 4 tubes of metal conduit were cut to length to end at/in the box. At the stores, none of the the "old construction" ceiling fan braces had more than 2 knockouts on the top. In other words, I got stuck because I didn't know how I would make the connection between the final few inches and the side knockouts on a new box. Hypothesis: use flexible metallic conduit for the final few inches (no splicing of wires will be necessary).

I'm curious how this problem is handled by others. Thanks for reading.

joed 04-18-2010 01:41 PM

Cut/drill the needed holes.
Attach the existing box to your new fan brace.

tabatt07 04-20-2010 05:43 AM

Quote:

Originally Posted by joed (Post 430249)
Cut/drill the needed holes.
Attach the existing box to your new fan brace.

That solves one problem but how would the fan be mounted to the box? I read that ceiling fans should not be attached to dog ears.

secutanudu 04-20-2010 06:30 AM

Quote:

Originally Posted by tabatt07 (Post 430940)
That solves one problem but how would the fan be mounted to the box? I read that ceiling fans should not be attached to dog ears.

Take a look at a fan-rated box - they have dog ears too. Your metal box will be fine. I think the fan rating has more to do with the box coming off of the ceiling than the fan coming off of the box.

http://z.about.com/d/homerepair/1/0/...g_fan_text.jpg

skidrowpete 04-22-2010 08:31 PM

your local electrical distibutor has an electricl fitting that takes two[2] mc or greenfield cables that will fit in a 1/2 inch ko problem solved for 4 cables in 2 holes skidrowpete

petey_c 04-22-2010 10:05 PM

tabatt07, If you've checked HD or Lowe's try an electrical supply house next. Since Chicago requires everything to be run in conduit, that would be your best choice. The dog ears for fan rated boxes are a little more substantial than a standard 4" octagonal box, to support the weight/motion of the fan. A properly balanced fan should have minimal side to side motion. Good luck, petey

goose134 04-26-2010 12:03 AM

If you've got an old Chicago house with the iron pancake box and rigid pipe, you'll be fine hanging a fan on it. The box itself should be supported with a steel rectangular bar through the top, plus the hits of rigid. The screws are only 8/32 so I usually drill and tap for a larger screw into the body of the box.
I'm in the city and have seen a lot of these.


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